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CONTRIBUTING.md

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+# Contributing to WiiCompiled
+
+Thanks for wanting to help! A few ground rules
+
+## The short version
+
+- Code is judged on quality, not where it came from
+- You must be able understand and be able to explain every line you submit.
+- PR descriptions and responses must be written by you, **not** generated.
+- Accuracy is the bar for anything touching game behavior.
+
+## Code quality
+
+We don't care how your code came into existence. What we care about is whether it meets the
+project's patterns and standards, and the only way we measure that is by
+reading it.
+
+Low-quality code won't be merged, regardless of origin. AI slop and human slop
+get the same treatment.
+
+## If you use AI tools
+
+That's ok, but rules apply:
+
+1. **You must be able to explain your changes.** If a reviewer asks why a line
+   exists or what a function does and you can't answer, the PR will be closed.
+   "The AI wrote it" is not an explanation.
+2. **Write your own PR description.** The description exists so reviewers know
+   what you changed and why, in your words. Generated descriptions tend to
+   describe everything and explain nothing, and they will get your PR closed.
+
+## Pull requests
+
+- Keep PRs focused. try and keep it at 1 change per PR. 
+  Small PRs get reviewed fast.
+- Explain **what** and **why**. Reference the issue if there is one.
+- For anything affecting game behavior: identical behavior to real hardware is
+  the goal. Be prepared to show your change doesn't diverge from the original
+  game (hardware comparison, logs, whatever fits).
+- Review feedback. It's about the code, not about you ;).
+
+## Bug reports
+
+See the FAQ in the [README](README.md)
+
+## A note on related projects
+
+WiiCompiled, Wheel Wizard, and other projects in this ecosystem are developed
+independently and each has its **own** contribution rules and all have their own
+rules around AI usage. What applies here does not automatically apply there,
+and vice versa. Check each project's own CONTRIBUTING file.
+
+## Legal
+
+- Never!!! include Nintendo code, assets, or game data in a PR, an issue, or
+  anywhere else in this project. No exceptions.
+- By contributing, you agree your contributions are licensed under
+  [GPL v3.0](LICENSE), like the rest of the project.